Sharing your feelings doesn't really mean breaking down crying when anything remotely bad happens to you in life. It can just be talking frankly and openly about challenges you face in your life. Is that at odds with being stoic?
Not at all. I'd say the motivation for talking things through lies on a spectrum between brainstorming and bitching, and people have a need for both, just be aware of which one you're doing. A complaint can be stoic.